研究者詳細 - 馬　廷麗

論文 - 馬　廷麗

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Perovskite solar cell for space application 査読有り

Bautista I.Z.C., Shuzhang Y., Ma T., Cho M.

Proceedings of the International Astronautical Congress, IAC 2019-October 2019年01月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

Satellite developers are continuously doing research on satellite energy sources that are efficient, lightweight and cheap than the current Silicon and triple-junction solar cells being used. The emergence of organic-inorganic metal halide Perovskite solar cells (PSC) which, have high specific power (kW/kg), achieved record power conversion efficiencies greater than 22% and cheap to manufacture, has attracted the attention of scientists for its possibility to replace silicon and triple junction solar cells. These factors make Perovskite solar cells viable candidates for space applications. To determine the feasibility of PSCs in space, samples were tested under simulated Low Earth Orbit (LEO) space environment such as thermal cycle, vacuum, vibration, total ionization dosage and electron radiation. Results showed that PSC has the ability to survive and work in space with thermal variation having the largest effect on the performance of the PSC.

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Indium Zinc Oxide Electron Transport Layer for High-Performance Planar Perovskite Solar Cells 査読有り

Wang L.

Journal of Physical Chemistry C 122 ( 50 ) 28491 - 28496 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 American Chemical Society. Besides the high-quality perovskite light absorbing layer, the electron and hole transport layers also play significant roles in achieving high-efficiency planar perovskite solar cells (PVSCs). In this study, a facile, environmentally friendly, one-step spinning coating method is employed to fabricate high-quality indium zinc oxide (IZO) electron transport layer (ETL). Improvements in charge transport, conductivity, and light transmittance of IZO ETL relative to that of TiO2-ETL should be responsible for the large short circuit current density of PVSCs. Using this optimized IZO ETL film, a high-power conversion efficiency (PCE) of 16.25% was achieved, which resulted in an absolute efficiency gain of 2.42% compared with TiO2-based PVSC (13.83%). A steady-state efficiency of 15.8% with negligible hysteresis was also demonstrated.

DOI： 10.1021/acs.jpcc.8b08869

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One-pot synthesis of 2D Ti <inf>3</inf> C <inf>2</inf> /Ni <inf>2</inf> CO <inf>3</inf> (OH) <inf>2</inf> composite as electrode material with superior capacity and high stability for hybrid supercapacitor 査読有り

Guo J., Zhao Y., Jiang N., Liu A., Gao L., Li Y., Wang H., Ma T.

Electrochimica Acta 292 168 - 179 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier Ltd MXene-based materials are promising electrode materials for supercapacitors. Herein, Ni 2 CO 3 (OH) 2 nanosheets and/or nanoparticles are in-situ grown on the surface of two-dimensional (2D) Ti 3 C 2 to form Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composites during one-pot hydrothermal processing. The uniform distribution of Ni 2 CO 3 (OH) 2 on Ti 3 C 2 is due to the electrostatic interaction between positively charged nickel ions and negatively charged Ti 3 C 2 . Importantly, the electrochemical performance of Ti 3 C 2 /Ni 2 CO 3 (OH) 2 are enhanced. The 30-Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composite electrode exhibits a specific capacity of 173.8 mAh g −1 at 1 A g −1 and excellent cycling stability (capacity retention of 80.1% after 5000 cycles at 10 A g −1 ). The hybrid supercapacitor using 30-Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composite as positive electrode and active carbon as negative electrode delivers a high energy density of 28.2 Wh kg −1 at a power density of 374.8 W kg −1 . The super performance of the composite electrode is attributed to the synergistic effects of good redox activity of Ni 2 CO 3 (OH) 2 particles combined with high electronic conductivity of 2D Ti 3 C 2 . The excellent electrochemical performance of Ti 3 C 2 /Ni 2 CO 3 (OH) 2 composite indicates its potential as a promising electrode material to high energy/power density energy storage devices.

DOI： 10.1016/j.electacta.2018.09.148

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Interfacial Sulfur Functionalization Anchoring SnO<inf>2</inf> and CH<inf>3</inf>NH<inf>3</inf>PbI<inf>3</inf> for Enhanced Stability and Trap Passivation in Perovskite Solar Cells 査読有り

Wang Z., Kamarudin M., Huey N., Yang F., Pandey M., Kapil G., Ma T., Hayase S.

ChemSusChem 11 ( 22 ) 3941 - 3948 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Trap states at the interface or in bulk perovskite materials critically influence perovskite solar cells performance and long-term stability. Here, a strategy for efficiently passivating charge traps and mitigating interfacial recombination by SnO2 surface sulfur functionalization is reported, which utilizes xanthate decomposition on the SnO2 surface at low temperature. The results show that functionalized sulfur atoms can coordinate with under-coordinated Pb2+ ions near the interface. After device fabrication under more than 60 % humidity in ambient air, the efficiency of methylammonium lead iodide (MAPbI3) perovskite solar cells based on sulfur-functionalized SnO2 increased from 16.56 % to 18.41 % with suppressed hysteresis, which resulted from the accelerated interfacial charge transport kinetics and decreased traps in bulk perovskite by interfacial sulfur functionalization. Additionally, thermally stimulated current studies show the decreased trap density in the shallow trap area after interfacial sulfur functionalization. The interfacial sulfur functionalized solar cells without sealing also exhibited considerable retardation of solar cell degradation with only 10 % degradation after 70 days air storage. This work demonstrates a facile sulfur functionalization strategy by using xanthate decomposition on SnO2 surfaces to obtain highly efficient perovskite solar cells.

DOI： 10.1002/cssc.201801888

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High Electrical Conductivity 2D MXene Serves as Additive of Perovskite for Efficient Solar Cells 査読有り

Guo Z., Gao L., Xu Z., Teo S., Zhang C., Kamata Y., Hayase S., Ma T.

Small 14 ( 47 ) 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim MXenes, a newly intriguing family of 2D materials, have recently attracted considerable attention owing to their excellent properties such as high electrical conductivity and mobility, tunable structure, and termination groups. Here, the Ti3C2Tx MXene is incorporated into the perovskite absorber layer for the first time, which aims for efficiency enhancement. Results show that the termination groups of Ti3C2Tx can retard the crystallization rate, thereby increasing the crystal size of CH3NH3PbI3. It is found that the high electrical conductivity and mobility of MXene can accelerate the charge transfer. After optimizing the key parameters, 12% enhancement in device performance is achieved by 0.03 wt% amount of MXene additive. This work unlocks opportunities for the use of MXene as potential materials in perovskite solar cell applications.

DOI： 10.1002/smll.201802738

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Addition Effect of Pyreneammonium Iodide to Methylammonium Lead Halide Perovskite-2D/3D Heterostructured Perovskite with Enhanced Stability 査読有り

Yang F., Zhang P., Kamarudin M., Kapil G., Ma T., Hayase S.

Advanced Functional Materials 28 ( 46 ) 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim Despite the eminent performance of the organometallic halide perovskite solar cells (PSCs), the poor stability for humidity and ultraviolet irradiation is still major problem for the commercialization of PSCs. Herein, a novel functional organic compound 1-(ammonium acetyl)pyrene is successfully introduced for preparing the 2D/3D heterostructured MAPbI3 perovskite. Because of the functional organic pyrene group with high humidity resistance and strong absorption in the ultraviolet region, the 2D/3D perovskite film shows notable stability with no degradation in ≈60% relative humidity after even six months and exhibits a high ultraviolet irradiation stability which keeps nearly no degradation after 1 h in the UV Ozone treatment. Planar PSCs are fabricated in the ≈60% relative humidity air outside glovebox. The champion efficiency of (PEY2PbI4)0.02MAPbI3 perovskite solar cells is 14.7% with nearly no hysteresis which is equal performance of 3D MAPbI3 devices (15.0%). This work presents a new direction for enhancing the solar cells' performance and stability by incorporating a functional organic aromatic compound into the perovskite layer.

DOI： 10.1002/adfm.201804856

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In Situ Growth of a Feather-like MnO <inf>2</inf> Nanostructure on Carbon Paper for High-Performance Rechargeable Sodium-Ion Batteries 査読有り

Li H., Liu A., Zhao S., Guo Z., Wang N., Ma T.

ChemElectroChem 5 ( 21 ) 3266 - 3272 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Recently, sodium-ion batteries have attracted great attention, owing to the rich resource and low cost. In the present work, a feather-like MnO 2 nanostructure was prepared directly on carbon paper by using a rapid and simple hydrothermal route for the first time. The formation mechanism was proposed by investigating the intermediate products during the reaction. When applied as an anode for a sodium-ion battery, the feather-like MnO 2 nanostructure on carbon paper exhibited a high discharge capacity, good rate reversibility, and long-term cycling stability. A high specific capacity of approximately 300 mAh g −1 could be obtained even after cycling 400 times with a current density of 0.1 A g −1 . Furthermore, the Na + storage mechanism of MnO 2 on carbon paper in the sodium-ion battery was also investigated in this work. Such high performance can be attributed to the porous structure of the substrate and high specific surface area of the feather-like nanostructure.

DOI： 10.1002/celc.201800830

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Enhanced performance of ZnO based perovskite solar cells by Nb <inf>2</inf> O <inf>5</inf> surface passivation 査読有り

Zhang P., Yang F., Kapil G., Shen Q., Toyoda T., Yoshino K., Minemoto T., Pandey S., Ma T., Hayase S.

Organic Electronics: physics, materials, applications 62 615 - 620 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. TiO 2 has been extensively utilized as bottom electron transporting scaffold for perovskite solar cells (PSCs) but need for its high processing temperature (>450 °C) hinders its applicability for the flexible plastic substrates. Use of the low temperature processed ZnO is one of the probable solutions as electron transport layer (ETL) in PSCs owing to its high electron mobility. An amicable solution for the instability of the perovskite absorber layers fabricated on to ZnO leading resulting in to poor power conversion efficiency (PCE) and long-term stability is necessary for to harness the benefit of ZnO as ETL in PSCs. Herein, we modified the ZnO surface by spin-coating an ultrathin Nb 2 O 5 as surface passivation layer. In this work, both of the ZnO and Nb 2 O 5 were fabricated by spin coating and sintered at relatively lower temperature of 200 °C. Utilizing this Nb 2 O 5 surface passivated and low temperature processed ZnO as ETL, dramatically enhanced stability of perovskite film over 20 days under ambient condition has been clearly demonstrated. This bilayer of Nb 2 O 5 surface passivated ZnO scaffold used for fabrication of the planer heterojunction PSCs based on CH 3 NH 3 PbI 3 , led to the maximum PCE of 14.57% under simulated solar irradiation for an optimized ZnO thickness of 42 nm. Moreover, implication of the surface passivation of ZnO by Nb 2 O 5 leading to the formation of highly crystalline, stable and dense perovskite film has been probed by SEM and XRD investigations.

DOI： 10.1016/j.orgel.2018.06.038

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In situ fabrication of 2D SnS <inf>2</inf> nanosheets as a new electron transport layer for perovskite solar cells 査読有り

Zhao E., Gao L., Yang S., Wang L., Cao J., Ma T.

Nano Research 11 ( 11 ) 5913 - 5923 2018年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018, Tsinghua University Press and Springer-Verlag GmbH Germany, part of Springer Nature. To promote commercialization of perovskite solar cells (PSCs), low-temperature processed electron transport layer (ETL) with high carrier mobility still needs to be further developed. Here, we reported two-dimensional (2D) tin disulfide (SnS 2 ) nanosheets as ETL in PSCs for the first time. The morphologies of the 2D SnS 2 material can be easy controlled by the in situ synthesized method on the conductive fluorine-doped tin oxide (FTO) substrate. We achieved a champion power conversion efficiency (PCE) of 13.63%, with the short-circuit current density (J SC ) of 23.70 mA/cm 2 , open-circuit voltage (V OC ) of 0.95 V, and fill factor (FF) of 0.61. The high J SC of PSCs results from effective electron collection of the 2D SnS 2 nanosheets from perovskite layer and fast electron transport to the FTO. The low V OC and FF are the results of the lower conduction band of 2D SnS 2 (4.23 eV) than that of TiO 2 (4.0 eV). These results demonstrate that 2D material is a promising candidate for ETL in PSCs. [Figure not available: see fulltext.].

DOI： 10.1007/s12274-018-2103-z

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One-step salt-assisted solution combustion synthesis of Ni-based composites for use as supercapacitor electrodes 査読有り

Zhao Y., Jiang N., Zhang X., Guo J., Yang Q., Gao L., Li Y., Ma T.

Journal of Alloys and Compounds 765 396 - 404 2018年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. Low cost mass production of Ni-based composites on an industrial scale with high electrochemical performance is of practical interest for supercapacitors. In this report, various Ni-based composites containing Ni2(CO3)(OH)2, Ni3(NO3)2(OH)4, NiC2O4or NiO have been successfully synthesized via a one-step salt-assisted solution combustion synthesis at a temperature of 215 °C. The morphology and chemical composition of the as-obtained products can be controlled by monitoring the reaction parameters inclusive of the initial concentration of salt solution, and salt species. NC-1.0 composite obtained by salt-assisted solution combustion synthesis delivers higher specific capacitance (1420 F g−1at 1 A g−1), and better cycling performance (60.0% after 2000 cycles) than those of NC-0.0 (1260 F g−1at 1 A g−1, 53.6% after 2000 cycles) achieved by conventional solution combustion synthesis. Hybrid supercapacitor with NC-1.0 composite as positive electrode and active carbon as negative electrode delivers high energy density (32.5 Wh kg−1at a power density of 310.2 W kg−1). The performance of the obtained Ni-based composites as supercapacitor electrodes demonstrates their potential for upcoming electronic devices.

DOI： 10.1016/j.jallcom.2018.06.166

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Pr/Ba cation-disordered perovskite Pr<inf>2</inf>/<inf>3</inf>Ba<inf>1</inf>/<inf>3</inf>CoO<inf>3</inf><sup>1</sup><inf>δ</inf> as a new bifunctional electrocatalyst for oxygen reduction and oxygen evolution reactions 査読有り

Zhang W., Shiraiwa M., Wang N., Ma T., Fujii K., Niwa E., Yashima M.

Journal of the Ceramic Society of Japan 126 ( 10 ) 814 - 819 2018年10月

記述言語：英語掲載種別：研究論文（国際会議プロシーディングス）

©2018 The Ceramic Society of Japan. Electrocatalysts for oxygen evolution reaction (OER) and oxygen reduction reaction (ORR) play an important role in renewable energy source technologies, typically including metal-air batteries, fuel cells and water splitting devices. Therefore, the development of bifunctional catalysts for OER and ORR is of great importance to enhance the performance of these devices. Herein, we present a Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO31δ, as a novel bifunctional catalyst for OER and ORR. Here δ is the content of oxygen vacancies. Rietveld refinement of the X-ray powder diffraction data of Pr2/3Ba1/3CoO2.98 was successfully performed by a single phase with an orthorhombic Pnma Pr/Ba cation-disordered perovskite-type structure. The bond valence sum of Co cation, 3.11 and thermogravimetric measurements suggested the coexistence of Co3+, Co4+, Pr3+ and Pr4+ cations in the bulk Pr2/3Ba1/3CoO2.98. The X-ray photoemission spectroscopy of Pr2/3Ba1/3CoO2.98 indicated the coexistence of these four cations at the sample surface, which would improve the electrocatalysis. The electrical conductivity · of Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO31δ was higher than that of Pr/Ba cation-ordered layered perovskite PrBaCo2O61δ. The · of Pr2/3Ba1/3CoO31δ and PrBaCo2O61δ decreased with an increase of temperature. The concentration of oxygen vacancies δ of Pr2/3Ba1/3CoO31δ increased with increasing temperature. Electrochemical measurements of the Pr/Ba cation-disordered perovskite Pr2/3Ba1/3CoO2.98 indicated higher OER and ORR catalytic activities, compared to the Pr/Ba cation-ordered layered perovskite PrBaCo2O61δ. The Pr2/3Ba1/3CoO2.98 exhibited higher bifunctional electrocatalytic activities compared with many bifunctional catalysts in the literature. These results highlight the Pr/Ba cation-disordered perovskite-type Pr2/3Ba1/3CoO31δ as a promising bifunctional catalyst for renewable energy applications.

DOI： 10.2109/jcersj2.18076

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Seamless Interfacial Formation by Solution-Processed Amorphous Hydroxide Semiconductor for Highly Efficient Electron Transport 査読有り

Yang S., Song X., Gao L., Wang N., Ding X., Wang S., Ma T.

ACS Applied Energy Materials 1 ( 9 ) 4564 - 4571 2018年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2018 American Chemical Society. Reducing the energy barriers for charge carrier injection, extraction, or transport within both electron- and hole-transporting interfaces is crucial for minimizing charge carrier transport losses in perovskite solar cells (PSCs). In this Article, an ultrafast, solution-processed hydroxide semiconductor material, called Nb(OH) 5 , which has a similar energy band and transparency to its crystallization, Nb 2 O 5 , is first used as an electron transport layer (ESL) for PSCs. The conductivity of the Nb(OH) 5 is lower than that of Nb 2 O 5 ; however, a power conversion efficiency (PCE) of approximately 13.62% is obtained by fully fabricating devices at room temperature with a MAPbI 3 light absorption layer, which is almost the same as that of PSCs based on Nb 2 O 5 . The performance of the fabricated device shows that the Nb(OH) 5 film has seamless contact with the fluorine-doped tin oxide (FTO) substrate. The conductivity of the Nb 2 O 5 film is 4 orders larger than that of Nb(OH) 5 ; however, a low interfacial barrier results in interfacial resistance between the Nb(OH) 5 and FTO substrate that is 3-4 orders lower than that of Nb 2 O 5 due to universal quasi-ohmic contacts. By comparing with properties of PSCs with different ESLs (Nb(OH) 5 and Nb 2 O 5 ), a further efficient electron extract principle from the perovskite layer to FTO substrate is promoted. The PCE of PSCs still needs to be improved further; however, this solution-processed hydroxide semiconductor material, Nb(OH) 5 , has shown numerous benefits to PSCs with ultrafast process, low cost, and large-area fabrication.

DOI： 10.1021/acsaem.8b00681

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Low-cost, large-scale, one-pot synthesis of C/Ni <inf>3</inf> (NO <inf>3</inf> ) <inf>2</inf> (OH) <inf>4</inf> composites for high performance supercapacitor 査読有り

Zhao Y., Jiang N., Zhang X., Guo J., Li Y., Gao L., Wang H., Ma T.

Materials Chemistry and Physics 217 291 - 299 2018年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Elsevier B.V. In this study, we report a series of carbon/nickel-based composites. The composites are prepared through a facile one-pot solution combustion method by using nickel nitrate hydrate (Ni(NO 3 ) 2 ·6H 2 O) as an oxidizer and glucose (C 6 H 12 O 6 ) as a fuel material. The phase, component and electrochemical capacitive behavior of the as-prepared samples are investigated. The component of the obtained composites could be simply controlled by changing the ratio of NO 3− /C 6 H 12 O 6 . Novel C/Ni 3 (NO 3 ) 2 (OH) 4 composites are obtained at high molar ratio of NO 3− /C 6 H 12 O 6 (larger than 9) for the first time. The as-prepared C/Ni 3 (NO 3 ) 2 (OH) 4 composite shows battery-type behavior and exhibits a specific capacity of 630 C g −1 (1260 F g −1 ) at the current density of 1 A g −1 , which is ca. 2–10 fold higher than those of C/NiO composite (414 C g −1 , 828 F g −1 ) and C/NiO/Ni composite (65 C g −1 , 129 F g −1 ). In addition, C/Ni 3 (NO 3 ) 2 (OH) 4 composite exhibits an excellent rate performance (448 C g −1 , 996 F g −1 at 10 A g −1 ) and good cyclic stability. The results indicate that the C/Ni 3 (NO 3 ) 2 (OH) 4 composite is a potential electrode material for electrochemical supercapacitor. This work also suggests that the solution combustion process is promising for large-scale production of materials for supercapacitors.

DOI： 10.1016/j.matchemphys.2018.06.082

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Solution-Processed Air-Stable Copper Bismuth Iodide for Photovoltaics 査読有り

Hu Z., Wang Z., Kapil G., Ma T., Iikubo S., Minemoto T., Yoshino K., Toyoda T., Shen Q., Hayase S.

ChemSusChem 11 ( 17 ) 2930 - 2935 2018年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Bismuth-based solar cells have been under intensive interest as an efficient non-toxic absorber in photovoltaics. Within this new family of semiconductors, we herein report a new, long-term stable copper bismuth iodide (CuBiI4). A solutionprocessed method under air atmosphere is used to prepare the material. The adopted HI-assisted dimethylacetamide (DMA) co-solvent can completely dissolve CuI and BiI3 powders with high concentration compared with other organic solvents. Moreover, the high vapor pressure of tributyl phosphate, selected for the solvent vapor annealing (SVA), enables complete low-temperature (≤70 °C) film preparation, resulting in a stable, uniform, dense CuBiI4 film. The average grain size increases with the precursor concentration, greatly improving the photoluminescence lifetime and hall mobility; a carrier lifetime of 3.03 ns as well as an appreciable hall mobility of 110 cm2 V−1s−1 were obtained. XRD illustrates that the crystal structure is cubic (space group Fd3m) and favored in the [1 1 1] direction. Moreover, the photovoltaic performance of CuBiI4 was also investigated. A wide bandgap (2.67 eV) solar cell with 0.82 % power conversion efficiency is presented, which exhibits excellent long-term stability over 1008 h under ambient conditions. This air-stable material may give an application in future tandem solar cells as a stable short-wavelength light absorber.

DOI： 10.1002/cssc.201800815

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Performance Enhancement of Mesoporous TiO <inf>2</inf> -Based Perovskite Solar Cells by SbI <inf>3</inf> Interfacial Modification Layer 査読有り

Zhang P., Yang F., Kamarudin M., Ng C., Kapil G., Ma T., Hayase S.

ACS Applied Materials and Interfaces 10 ( 35 ) 29630 - 29637 2018年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 American Chemical Society. TiO 2 is commonly used as an electron-transporting material in perovskite photovoltaic devices due to its advantages, including suitable band gap, good photoelectrochemical stability, and simple preparation process. However, there are many oxygen vacancies or defects on the surface of TiO 2 and thus this affects the stability of TiO 2 -based perovskite solar cells under UV light. In this work, a thin (monolayer) SbI 3 modification layer is introduced on the mesoporous TiO 2 surface and the effect at the interface between of TiO 2 and perovskite is monitored by using a quartz crystal microbalance system. We demonstrate that the SbI 3 -modified TiO 2 electrodes exhibit superior electronic properties by reducing electronic trap states, enabling faster electron transport. This approach results in higher performances compared with electrodes without the SbI 3 passivation layer. CH 3 NH 3 PbI 3 perovskite solar cells with a maximum power conversion efficiency of 17.33% in air, accompanied by a reduction in hysteresis and enhancement of the device stability, are reported.

DOI： 10.1021/acsami.8b10062

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Environmental effects on the ionic conductivity of poly(methyl methacrylate) (PMMA)-based quasi-solid-state electrolyte 査読有り

Xu T., Li J., Gong R., Xi Z., Huang T., Chen L., Ma T.

Ionics 24 ( 9 ) 2621 - 2629 2018年09月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2017, Springer-Verlag GmbH Germany, part of Springer Nature. Quasi-solid-state dye-sensitized solar cells (QS-DSSCs) using polymer electrolytes display excellent long-term stability with comparable light to electricity conversion efficiency (PCE). In this paper, poly(methyl methacrylate) (PMMA) is chosen as the template polymer, and polymer viscosity and its weight percentage of PMMA in the I3−/I−electrolyte system are optimized considering the competitive factors of the ionic conductivity (σ) and gel dimension stability. A systematic study is carried out to study the environmental factors on the ionic conductivity of quasi-solid electrolytes in terms of storage time, thermal stress, and light soaking. In the different temperature range, the polymer presents different aggregation states and molecular motion forms, which results in different conductive mechanism of the gel electrolyte. It could be described by the Arrhenius equation in the sol state and the Vogel–Tammann–Fulcher (VFT) equation on the gel state, respectively. Both the cyclic voltammetry curve and the Tafel polarization curve indicate that the quasi-solid electrolyte exhibits a lower ion diffusion and transport capacity (1.83 × 10−6 cm2/s) than that of the liquid electrolyte (9.15 × 10−6 cm2/s). This work provides new insights about the degradation mechanism of polymer electrolytes for QS-DSSC application. [Figure not available: see fulltext.].

DOI： 10.1007/s11581-017-2397-y

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Study to Observe the Effect of PbI<inf>2</inf>Passivation on Carbon Electrode for Perovskite Solar Cells by Quartz Crystal Microbalance System 査読有り

Zhang P., Kapil G., Hamada K., Pandey S., Ma T., Hayase S.

ACS Sustainable Chemistry and Engineering 6 ( 8 ) 10221 - 10228 2018年08月

記述言語：英語掲載種別：研究論文（学術雑誌）

Copyright © 2018 American Chemical Society. A perovskite solar cell (PSC) utilizing a carbon electrode is a potential candidate for industrially viable, low-cost and highly stable photovoltaics. Therefore, it is important to understand the interface between perovskite layer and carbon electrode to achieve the improved performance of PSCs. We demonstrate an improvised two-step perovskite MAPbI3(methylammonium lead iodide) deposition method, involving a pretreatment of PbI2on the porous structure of TiO2/ZrO2/Carbon, which led to the difference in performance. A PbI2passivation layer at the interface between carbon electrode and perovskite resulted in the improved power conversion efficiency (PCE) of 7.30% from 2.21% compared to a one-step perovskite deposition with no pretreatment of PbI2. This study further explores that an enhanced PCE of 6.55% can be achieved with one-step fabrication while keeping the same perovskite. A fascinating methodology, utilizing quartz crystal microbalance (QCM), which involves the adsorption of PbI2on the carbon surface, was employed to unravel this difference. QCM monitored adsorbed mass in real time and revealed that the mass of PbI2on carbon layer increased with the increase in concentration of PbI2in dimethylformamide (DMF). It was noticed that PbI2was still adsorbed on the carbon surface even after rinsing with DMF, suggesting strong bonding of PbI2with carbon. PbI2presence after rinsing was also verified by X-ray photoelectron spectroscopy (XPS), which indicates that part of the Pb-I reacts with the -OH on the carbon surface forming C-O-Pb linkages. Our study demonstrates that a carbon electrode passivated with PbI2could reduce carrier recombination and improve performance of PSCs.

DOI： 10.1021/acssuschemeng.8b01550

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Magnesium-Doped MAPbI<inf>3</inf>Perovskite Layers for Enhanced Photovoltaic Performance in Humid Air Atmosphere 査読有り

Yang F., Kamarudin M., Kapil G., Hirotani D., Zhang P., Ng C., Ma T., Hayase S.

ACS Applied Materials and Interfaces 10 ( 29 ) 24543 - 24548 2018年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 American Chemical Society. Despite the high efficiency of MAPbI3perovskite solar cells, the long term stability and degradation in humid atmosphere are issues that still needed to be addressed. In this work, magnesium iodide (MgI2) was first successfully used as a dopant into MAPbI3perovskite prepared in humid air atmosphere. Mg doping decreased the valence band level, which was determined from photoelectron yield spectroscopy. Compared to the pristine MAPbI3perovskite film, the 1.0% Mg-doped perovskite film showed increased crystal grain size and formation of pinhole-free perovskite film. Performance of the solar cell was increased from 14.2% of the doping-free solar cell to 17.8% of 1.0% Mg-doped device. Moreover, 90% of the original power conversion efficiency was still retained after storage in 30-40% relative humidity for 600 h.

DOI： 10.1021/acsami.8b06619

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Enhanced Crystallization by Methanol Additive in Antisolvent for Achieving High-Quality MAPbI<inf>3</inf>Perovskite Films in Humid Atmosphere 査読有り

Yang F., Kamarudin M., Zhang P., Kapil G., Ma T., Hayase S.

ChemSusChem 11 ( 14 ) 2348 - 2357 2018年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim Perovskite solar cells have attracted considerable attention owing to their easy and low-cost solution manufacturing process with high power conversion efficiency. However, the fabrication process is usually performed inside a glovebox to avoid moisture, as organometallic halide perovskites are easily dissolved in water. In this study, we propose a one-step fabrication of high-quality MAPbI3perovskite films in around 50 % relative humidity (RH) humid ambient air by using diethyl ether as an antisolvent and methanol as an additive into this antisolvent. Because of the presence of methanol, the water molecules can be efficiently removed from the gaps of the perovskite precursors and the perovskite film formation can be slightly controlled, leading to pinhole-free and low roughness films. Concurrently, methanol can be used to tune the DMSO ratio in the intermediate perovskite phase to regulate perovskite formation. Planar solar cells fabricated by using this method exhibited the best efficiency of 16.4 % with a reduced current density–voltage hysteresis. This efficiency value is approximately 160 % higher than the devices fabrication by using only diethyl ether treatment. From the impedance measurement, it is also found that the recombination reaction is suppressed when the device is prepared with methanol additive in the antisolvent. This method presents a new path for controlling the growth and morphology of perovskite films in humid climates and laboratories with uncontrolled environments.

DOI： 10.1002/cssc.201800625

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Minute quantities of hexagonal nanoplates PtFe alloy with facile operating conditions enhanced electrocatalytic activity and durability for oxygen reduction reaction 査読有り

Wang N., Li Y., Guo Z., Li H., Hayase S., Ma T.

Journal of Alloys and Compounds 752 23 - 31 2018年07月

記述言語：英語掲載種別：研究論文（学術雑誌）

© 2018 Pt-based alloys have been explored as the most promising cathode catalyst for fuel cells due to their excellent electrocatalytic activity in oxygen reduction reaction (ORR). However, the long-term performance of Pt-based alloys is compromised owing to the de-alloying behavior under the corrosive circumstance. More importantly, the complicated synthesized methods have hindered their further practical application. In this report, a facile and effective operating conditions-assisted method has been developed to synthesize the stable hexagonal nanoplates PtFe alloy with a high electrocatalytic activity. In the three prepared PtM (M: Fe, Co, Ni) alloy samples, the PtFe alloy exhibits a superior catalytic activity, which improves by about 100 and 178 mV for half-wave potential in alkaline and acidic medium with the same Pt-loading amount, respectively. In addition, the PtFe alloy catalyst exhibits an electrochemical stability, compared to the conventional carbon-supported Pt catalysts. In view of the advantages of the facile operating preparation and the excellent electrocatalytic performance, we believe that the hexagonal nanoplates PtFe alloy holds great application as a promising electrocatalyst in polymer electrolyte membrane fuel cell (PEMFC).

DOI： 10.1016/j.jallcom.2018.04.181

その他リンク： https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85045582373&origin=inward

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